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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135ffe377ffdd0a0adc4b8924216c90676de676374ac7921dd5d9ab8b34b6c07' 
  AND token = 'S29iKSY5Hxq4VmUmvt4uS1kAG52gI8IOpCUslryQnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}